You say it would not turn over, even with the booster and the car battery? Is the engine actually turning over as you try and start it or are there any clicks when you turn the key? Do all the dash lights comer on and do they dim as you turn the key? If none of these happen, I would be looking at the immobiliser.
Allan

i suspect you have a bad earth strap, which is a common problem. the engine earth strap is underneath and gets road dirt and muck on it. this rots the copper and gives the symptoms you describe. ie fully charged but engine wont turn over properly

to prove it and rule out the starter motor, connect a jump lead from the van battery negative to a clean part on the engine block. if it works fit a new earth strap. if not you need to remove and test the starter motor and ensure the electrics are all functioning

i suspect you have a bad earth strap, which is a common problem. the engine earth strap is underneath and gets road dirt and muck on it. this rots the copper and gives the symptoms you describe. ie fully charged but engine wont turn over properly

to prove it and rule out the starter motor, connect a jump lead from the van battery negative to a clean part on the engine block. if it works fit a new earth strap. if not you need to remove and test the starter motor and ensure the electrics are all functioning

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beat me to it.

Before removing the starter to check it try giving it a firm tap a couple of times with a hammer or use a steel bar....... pool cue fashion....if you cant get a hammer in..

Starter brushs could be sticking or a dirty comutator and a good tap should free them.

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Sounds like immobilizer [HI]or starter motor/solenoid/exiterwire.[/HI]Does the padlock symbol on the dash go out OK?

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TheBig1;931623[HI said:

]i suspect you have a bad earth strap[/HI], which is a common problem. the engine earth strap is underneath and gets road dirt and muck on it. this rots the copper and gives the symptoms you describe. ie fully charged but engine wont turn over properly

From past experience, sound advice there,

Pappajohn, The big 1, on Ducato's isn't the Immobiliser on the Fuel Pump??? Seem to remember a Recovery Fella telling me that, BUT at 74 , hey ho could be mistakenoh:

OK. before you get to carried away make sure the jumper leads and battery are up to the job!
Cheap shoelace type of jump leads are a waste of time.
Trying to jump start a diesel engine in this cold weather every thing needs to be 100% and be careful when using leads its easy to spike ecu
HTH
Tony